'Clones' are individuals that have exactly the same a) lifespan b) physiology c) growth rate d) genetic makeup

Options

A. lifespan
B. physiology
C. growth rate
D. genetic makeup.

Explanation

To solve the question "Clones are individuals that have exactly the same," we need to analyze the options provided:

1. **Lifespan**: While some organisms may share a similar lifespan, it is not a definitive characteristic of clones. Different species or individuals can have the same lifespan without being clones.

2. **Physiology**: Similar physiological traits can be observed in different individuals or species. For example, humans and apes can have similar physiological characteristics, but they are not clones. Therefore, physiology does not define clones.

3. **Growth Rate**: Clones may exhibit similar growth rates, but growth rates can also be similar among non-clones. For instance, siblings may grow at the same rate but are not clones of each other.

4. **Genetic Makeup**: Clones are defined by their identical genetic composition. They are exact copies of each other at the genetic level, meaning they have the same genes and genetic traits.

Based on this analysis, the correct answer is:

**d) genetic makeup**

### Step-by-Step Solution:
1. **Understand the Definition of Clones**: Clones are individuals that are genetically identical to one another.
2. **Evaluate Each Option**:
- Lifespan: Not exclusive to clones.
- Physiology: Can be similar in non-clones as well.
- Growth Rate: Can vary among non-clones.
- Genetic Makeup: This is the defining characteristic of clones.
3. **Conclude**: Since clones share the same genetic makeup, the answer is d) genetic makeup.